Unless you have some monopoly on grief - or are the only one of us who has ever lost a young family member (you aren't by a long shot), all you're saying is that YOUR grief, in one particular circumstance, was different than another person's grief in an entirely different circumstance. You didn't have the anxiety of being on a television interview - which may have contributed to nervousness or even near hysteria prior to discussing a tragedy. You didn't have your personal tragedy become international news, adding a different level of emotions to an already horrific set of circumstances. You don't know what effects exhaustion, trauma, anxiety, or anything else played on this parent, or every single thought that can enter a mind during tragic times.
I don't care to get into a pissing contest with you over "My grief is greater than your grief, because..." It's irrelevant. Neither of us are the parents in the video. Neither of us lost children during this massacre and neither of us know anything about these people. Try showing a bit of compassion for someone who has just lived his worst nightmare and come to the realization that good, sane and decent people can react differently under different circumstances. It's the mentality that "I would NEVER act a certain way during times which I've never had to live" that has given us people who stalk the rescuers of Sandy Hook.